What do dashed lines usually indicate in MEP prints?

Dashed lines in MEP (Mechanical, Electrical, and Plumbing) prints are primarily used to represent hidden components or elements that are not directly visible in the current view of the drawing. These may include piping, ductwork, or wiring that run behind walls, ceilings, or other surfaces, providing a clear indication of their presence without cluttering the visible aspects of the drawing. This practice is essential for ensuring that anyone interpreting the prints can understand the complete context of the installation, including the location of components that would otherwise be obscured from sight. Recognizing dashed lines as indicators of hidden elements allows professionals to accurately plan for construction and installation, facilitating smoother workflows and reducing potential errors during the process.